Monday, August 23, 2010

The marina at Shawnee State Park, Scioto County, Ohio. May not look like the most exotic locale in the world, but as we shall see, there are some very interesting critters to be found here. This is Ohio's Deep South; as far as one can move towards the equator and not dip their toes into the Ohio River. In fact, the marina is on our mightiest stream; the one that separates us from neighboring Kentucky. And a number of plants and animals reach the northern limits of their ranges in the Ohio River Valley.

Last year, John Howard and I were exploring here when we encountered one of the most magnificent beetles I had ever laid eyes on. John, who lives in the area and explores Ohio River habitats all of the time, had only seen it once, a few years prior. He took photos, but was unable to pin a name on the beast as it wasn't in any of his books or easily findable on Internet resources. Finally, I posted one of my photos to BugGuide.net and was rewarded with a quick reply - Amorpha Borer, Megacyllene decora.

The gentleman who provided the answer was none other than Eric Eaton, and he reported that he had seen but one despite living in Cincinnati for eleven years. By now, I was consumed with interest in this seemingly exotic bug, and we began plotting out an expedition to find more of these beetles in 2010. Last Sunday was the fateful day.

This insect will offer a suggestion of the showiness of our quarry. It is a Hickory Borer, Megacyllene caryae, which can be locally abundant in spring. Like other beetles in the genus Megacyllene, it is an apparent hornet mimic.

You may have seen this one - it often is found seeking nectar on goldenrod flowers from about now through fall. It's the Locust Borer, Megacyllene robiniae, another nice-looking bug. Still, it holds no candle to our quest beetle; the object of the chase of what may to date be the world's only Amorpha Borer Expedition.

Were we successful? You bet your longhorned beetle we were! Here it is - the dashing Amorpha borer, Megacyllene decora. What a bug! Even a beetle-hater would like it. Large and tinted in the most beautiful hue of orange-yellow imaginable, this black-dashed stunner inflames the passions of all who see it, and upon discovery some of our party were rolling on the ground in fits of rapturous ecstacy.

OK, maybe no one got quite that excited but we were pleased as punch to successfully score the beetle. Actually, the group was rather displeased with me soon after the first beetle was found. I spotted it nectaring on some Giant Goldenrod, Solidago gigantea, and demanded that the net be turned over to me. I took a clumsy swipe and whiffed, the beetle escaped, not to be seen again and before any photos of substance could be made.

But the expedition's greatest success was yet to come. Stumbling somewhat dejectedly over to the aforementioned marina, it didn't take long before Janet Creamer found our target. This beetle, which proved to be far bigger and better looking than the one that I scared off, was quite cooperative. Scores of photos were made, and the group was able to fawn over the Amorpha Borer for quite some time.

There are some essential botanical ingredients required for this beetle, it appears. One, its host plant, False Indigo, Amorpha fruticosa. This small woody shrub occurs sporadically along the bank of the Ohio River, and the river bank may be the only Ohio locale for the plant in its native range (False Indigo has spread far to the north as a weed). The beetle lays its eggs in False Indigo and the beetle grubs bore their way around in the tissue.

When the adults emerge, they seem to stay in the immediate proximity of the False Indigo plants from which they were spawned. At least the females seek nectar and they definitely have a taste for Late-flowering Thoroughwort, Eupatorium serotinum, which is the plant in the photo above. They'll also use goldenrods but few of those are in bloom in this habitat this early in the season. Find these plants growing together on the banks of the Ohio River in August, and you may have a decent shot at discovering this splashy insect.

Janet eventually captured the Amorpha Borer and it didn't take kindly to being fondled. Here, it attempts to rasp off her flesh with those formidable mandibles. The black triangular mark on the thorax isn't typical - usually there are black stripes that band this region. I think some of the orangish pubescence may have rubbed off, exposing the shiny shell underneath.

The bold members of our Amorpha Borer Expedition (L to R): Ned Keller, Janet Creamer, John Howard, Tricia West, Cheryl Harner, Kathy McDonald, Debbie Wolterman. Your narrator was made to take the photo and thus couldn't be in the photo.

I love stuff like this. Finding some bizarre new animal that no one seems to know much about, figuring out at least the basics of its life history and successfully finding more of them. I'd love to know more about Megacyllene decora if anyone, anywhere, who might stumble across this knows something of the beetle. Who knows, there may be some place they are common as dirt and slapped away like offending mosquitoes. I doubt it, though.

Thanks to my fellow expedition members for their bravery and hard work in seeking the Amorpha Borer.

3 comments:

This species isn't encountered commonly in Missouri, either. I have seen good numbers in the big river valleys in fall on goldenrod and snakeroot flowers - Amorpha is abundant in these areas.

One time I found a small stand of Amorpha in a prairie in western Missouri, cautiously inspected up and down the stems, and was fortunate to see an adult female crawling on the stem (presumably looking for oviposition sites).

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About Me

I am a lifelong Ohioan who has made a study of natural history since the age of eight or so - longer than I can remember! A fascination with birds has grown into an amazement with all of nature, and an insatiable curiosity to learn more. One of my major ambitions is to get more people interested in nature. The more of us who care, the more likely that our natural world will survive.

About the photos, and permission to use

Unless specifically noted, all photos used on this blog are by Jim McCormac, and are my copyrighted property. If you are interested in the use of any of these photos, please contact me at jimmccormac35 AT gmail DOT com. I am sometimes fine with loaning photos for educational or non-commercial uses, but please ask! I do not give permission for carte blanche use of photos from the site, so please do not ask.

I've been taking photographs for a few decades, but never became fully interested and engaged in photography until 2003. That's when I got my first digital camera. Since then, photography has become a passion and a steadily growing addiction. If you delve back far enough into this blog, you will see photos that were made with a variety of Panasonic point & shoot bridge cameras. Then came a Canon Rebel DSLR, followed by a Nikon D7000. I've since returned to Canon, and use their gear almost exclusively. My camera body is a Canon 5D Mark III, which is an awesome full-frame sensor camera. The lens bag includes the following Canon lenses: 100mm f/2.8L-macro; the sensational but bizarre MP-E 65 mega-macro; a 17-40mm f/4L wide-angle; and a 500mm f/4L II, sometimes used with a 1.4 extender (which makes it a 700mm). I've also got a Tamron 70-200mm (great lens!). I do lots of macro, and my typical flash gear is the Canon Twin-Lite setup. If the gear needs three-legged stabilization, it is mounted on a Manfrotto tripod, attached to an Induro Gimbal head. Finally, I've got a GoPro Hero, which is fully waterproof and can be used for underwater work. Sometimes I even use the camera or video feature on my iPhone 5S smartphone - it's amazing how good phone cameras have become.

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